农村混合物料干式厌氧发酵物性变化中试研究

为解决分散性及混杂性的农村有机固体废物的无害化、减量化处理及资源化利用问题,利用干式厌氧发酵技术与装置,将畜禽粪便、果蔬垃圾和秸秆等混合物料进行干式厌氧发酵处理,并对pH和有机质类TS、VS、COD_Cr、(DOC)及NH₄+-N浓度进行了检测. 结果表明:农村有机固废混合物料干式厌氧发酵起始阶段的pH为7.2,于第7天逐渐降至最低值(6.3),之后又逐渐上升至系统稳定,最后在7.0~7.6之间波动. 厌氧发酵物料TS和VS经厌氧发酵后被消耗,二者去除率分别为58.3%和65.4%. 厌氧发酵运行过程中物料w(DOC)由11 000 mg/kg降至6 095 mg/kg,去除率为44.6%,发酵液中ρ(COD_Cr)由初始的11 700 mg/L降至结束时的2 870 mg/L,COD_Cr去除率达75.5%. 50 d后w(DOC)和ρ(COD_Cr)保持稳定. 

Pilot Study on Dry-Anaerobic Digestion of Rural Organic Solid Waste

The aim of this research was to analyze the substance variation in pilot tests during the rural organic solid waste dry-anaerobic digestion process. The experimental materials were mixed with straw, garbage and livestock wastes. The organic testing parameters were linked to traditional parameters such as pH, total solids (TS), volatile solids (VS), chemical oxygen demand (COD_Cr), dissolved organic carbon (DOC) and ammonia nitrogen (NH₄+-N). The results indicated that pH in the reaction system was 7.2 initially, then decreased to 6.3 on the seventh day, and finally was maintained at 7.0-7.6. TS and VS of the substance decreased after digestion, with the degradation rates of TS and VS reaching 58.3% and 65.4%, respectively. DOC decreased from 11,000 mg/kg in the starting phase to 6,095 mg/kg in the final phase, with a degradation rate of 44.6%. COD_Cr from the fermentation liquor decreased from 11,700 mg/L in the starting phase to 2,870 mg/L in the final phase, with a degradation rate of 75.5%. After 50 days, the contents of DOC and COD_Cr were kept stable in the fermentation reactor.